Answer:The number of cards in the collection is 260.
Step-by-step explanation:What is a ratio?
Ratio expresses the relationship between two or more numbers. It shows the number of times that one value is contained in another value.
What is the number of cards in the collection?
Number of cards = (sum of ratios x number of baseball cards) / ratio of baseball cards
(13 x 120) / 6 = 260